need advice

About a month ago my husband tried to leave me, at 7 months pregnant I was devestaed, he said he loved me but he didn't feel the love between us anymore, I told him I would try harder, we promised to be better for each other, fast forward to now, I've been doing my best to cook more, clean more, show him more love, send him more loving text messages, give him more in bed.... but he hasn't tried at all, he has done the dishes 3 times in the past month, and has done 2 loads of laundry, that's it! he never tries to please me in bed, I never get any loving text message, he doesn't even get excited about our son coming into this world, every time I say anything about the pregnancy he avoids the subject and goes silent, what am I doing wrong? Why do I constantly feel like I'm the problem, like I'm never going to be enough for him?